for i=1:NI
    for j=1:NJ
        Xpp (i,j) = Xp (i); 
        Ypp (i,j) = Yp(j);
    end
end

for i=1:dimXu
    for j=1:dimYu
        Xup (i,j) = Xu (i); 
        Yup (i,j) = Yu(j);
    end
end

for i=1:dimXv
    for j=1:dimYv
        Xvp (i,j) = Xv (i); 
        Yvp (i,j) = Yv(j);
    end
end

plot (Xpp,Ypp,'Marker','x','Color','r','LineStyle','none','MarkerSize',6)
hold on
plot (Xup,Yup,'Marker','o','Color','b','LineStyle','none','MarkerSize',2)
plot (Xvp,Yvp,'Marker','v','Color','g','LineStyle','none','MarkerSize',4)
